Hi all, When I do the interoperation with others services, I found that there is problem might be the barrier for our interoperation. I use my client to invoke the service of Microsoft HPC group implementation, it returns a soap message which including a WS-Security header with timestamp. But when I use my client interacts with other two services: UVA .Net implementation and GenesisII, the return message doesn't contain any WS-Security header. Maybe we should make a agreement on whether to have the bi-direction WS-Security. Best Regards, Liang ZHONG Grid Computing Research Group Institute of Advanced Computing Technology, Beihang University Tel: +86 10 8231 6262 Fax: +86 10 8231 6796 Addr: Room 507, Building G,The New Main Building, 37# Xueyuan Rd., Haidian District, Beijing 100083, PRC